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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((4*n^3 + 10*n^2 + 4*n + (3*n^3 + 13*n^2 + n - 2)*x + (6*n^2 + 4*n + 2)*x^2 + 3*n*x^3)*v[i - 1] - ((2*n^2 + 5*n + 2)*x + (2*n^2 + 9*n + 4)*x^2 + (4*n + 4)*x^3 + 2*x^4)*deriv(v[i - 1], x))/(n^3 + 3*n^2 + 2*n + (2*n^2 + 3*n - 2)*x + (n + 2)*x^2)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i - 1, v[i])))};\nT(9)","reading":{"first_row":0,"offset":0,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-57b4b14604f4c0d7","steps":["D+1"],"edges":["e-49264023c59aa288"],"text":"A126216 \u2192 D+1"},"headline":"A126216 \u2192 D+1","chain":null}